But who pays for UBI? Isn't it you and I through taxes and inflation(theft)? If I then have no say in whether I want to pay up or not but the majority do want me to pay, isn't it dictatorship?

It is indicative that it is indeed dictatorship of the majority since I have received a massive number of downvotes for my sentiments on this matter.

If the majority decide that you should pay a tax, and you then become obligated to to pay that tax, that's democracy, not dictatorship. That doesn't mean it's good, it's just democratic.

This is an argument that comes up a lot and usually it becomes clearer when this concept of democracy is simplified anecdotally:

If 5 people come to you and take your car from you, most reasonable humans would call that theft and consider it to be immoral.

The same 5 people come to you and say, we're going to take a vote on whether we should take your car and give you a bicycle, but here's the consolation, you will also be included in the democratic process. I think we all know what the outcome of such an election would be. Would you consider that to be a moral or immoral thing?

Just because I'm included in a democratic process which I didn't sign up for in the first place doesn't make it right to replace my car with a bicycle.

Which is why democratic mob rule is a terrible, terrible idea. Removing the checks and balances on raw, unbridled democracy doesn't have a great track record, historically.

'dictatorship of the majority' sounds like democracy to me.